Isomerism
Previous year questions with solutions · 2000 – 2026
40 Questions
26 Papers covered
2.22% Weightage 2026 ▼ 66.7% vs last year
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Year-wise statistics questions · papers · average per paper · weightage Year Questions Papers Avg / paper Weightage 2026 2 2 1 2.22% ▼ 66.7% vs last year 2025 3 1 3 6.67% ▲ 573.3% vs last year 2022 1 2 0.5 0.99% ▼ 75.2% vs last year 2021 2 1 2 4.00% ▲ 80% vs last year 2017 1 1 1 2.22% ▼ 50% vs last year 2016 4 2 2 4.44% same as last year 2015 4 2 2 4.44% ▲ 100% vs last year 2014 1 1 1 2.22% ▼ 34.1% vs last year 2013 3 2 1.5 3.37% ▲ 169.7% vs last year 2012 1 2 0.5 1.25% ▲ 1.3% vs last year 2011 1 2 0.5 1.23% ▼ 50.6% vs last year 2010 2 2 1 2.50% ▲ 27.5% vs last year 2009 1 1 1 1.96% same as last year 2008 1 1 1 1.96% ▼ 51% vs last year 2007 2 1 2 4.00% ▲ 100% vs last year 2006 1 1 1 2.00% ▼ 50% vs last year 2005 2 1 2 4.00% ▲ 92% vs last year 2004 1 1 1 2.08% ▼ 49% vs last year 2003 2 1 2 4.08% ▲ 104.1% vs last year 2002 1 1 1 2.00% ▼ 49% vs last year 2001 2 1 2 3.92% same as last year 2000 2 1 2 3.92%
All 40 MCQ 39 Matching 1 Topic All topics Chiral Carbon and Basic Conditions for Optical Isomerism Cis/Trans Nomenclature, E/Z Nomenclature, Syn/Anti Nomenclature Conditions and Types for Geometrical Isomerism Conformational Isomerism Elements of Symmetry (POS, COS, AOS, AAS) Isomerism in coordination compounds Number of Stereoisomers Optical Activity Without a Classical Chiral Carbon R/S Nomenclature and D/L Nomenclature Relations Between Stereoisomers Retention, Inversion and Racemisation in Reactions Structural Isomerism Tautomerism Year All years 2026 2025 2022 2021 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000
Ques. 31 AIPMT 2005
Which one of the following pairs represents stereoisomerism?
Structural isomerism and geometrical isomerism Optical isomerism and geometrical isomerism Chain isomerism and rotational isomerism Linkage isomerism and geometrical isomerism.
Ques. 32 AIPMT 2004
The molecular formula of diphenylmethane, [figure] is C13H12. How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?
6 4 8 7
Ques. 33 AIPMT 2003
Which of the following pairs of compounds are enantiomers?
[figure] [figure] [figure] [figure]
Ques. 34 AIPMT 2003
In this reaction : CH3CHO + HCN CH3CH(OH)CN HOH CH3CH(OH)COOH an asymmetric centre is generated. The acid obtained would be
D-isomer L-isomer 50% D + 50% L-isomer 20% D + 80% L-isomer
Ques. 35 AIPMT 2002
Geometrical isomers differ in
position of functional group position of atoms spatial arrangement of atoms length of carbon chain
Ques. 36 AIPMT 2001
A compound of molecular formula C7H16 shows optical isomerism, compound will be
2,3-dimethylpentane 2,2-dimethylbutane 2-methylhexane none of these
Ques. 37 AIPMT 2001
[figure] obtained by chlorination of n-butane will be
meso form racemic mixture d-form l-form
Ques. 38 AIPMT 2000
2-Butene shows geometrical isomerism due to
restricted rotation about double bond free rotation about double bond free rotation about single bond chiral carbon
Ques. 39 AIPMT 2000
Dihedral angle in staggered form of ethane is
0 120 60 180